Boring device for boring machines



J. R. G. ADDINGTON. BORING DEVICE FOR BORING MACHINES.

APPLICATION FILED MAY151I920.

3 SHEETS-SHEET 1.

Patented Mar. 14, 1922.

n. {III .l. R. G. ADDINGTONi BORI'NG DEVICE FOR BORING MACHINES- APPLICATION man MAY 15. 1920 1,409,354, Patented Mar. 14, 1922..

3 SHEETSSHEET 2- 1. R. e. ADDINGTON. BORING DEVICE FOR BORING MACHINES.

' APPLICATION FlL ED MAY 15, I920. 1,409,354.

Patented Mar. 14, 1922.

3 $HEETS-SHEET 3- JAMES R, G; Apmne'ron, or NIGKELSVILLE, VIRGINIA, ASS-IGNQB or LLOYD c. GIIQLEY, or GATE ciiry, VIRGINIA.

ONE-HALF 'ro poems nnvrcn r013, eams riser- Inns 7 application filed May 15,

To all whom it may concern: Be it known that I, James R. G. A I

TON, a citizen ofthe United States, residing at Niclielsville, in the county of Scott and State of Virginia, have invented certain new and useful Improvements in Boring Devices Boring Machines, of which the following is a specification,reference being had to the accompanying drawings.

This invention 'relatesto tin-"improved boring device for boring machines, and an object of the invention is to provide a device ofthis kind for boring round, square, elliptical and like shaped holes .in various materials, and it is a further aim to provide a novel device of this kind which is very 'sim-' ple, efficient and practical in construction, capable of being cheaplymade for sale ata reasonable profit; .i

Another object is to provide a dev ce wherein -means is provided for boring a round hole, and also including means for squaring the corners, and also means for cleaning, out or removing the material from the hole between the square corners and the diametrically opposite portions of the hole at right angles 'to the square corners, therebyenabling the tool to bore aQsqnare' hole.

Still another object consists in the, provision of a boring tool including a mai.n bit, expansive and retracting bits and a pink ralit y of rotary bits which are revolvable in directions at right angles to the plane of movement of .the' main bit, whereby the square holes may be bored.

A further ob'ect conslsts in the proyision of a boring tool wherein a single rotating member is instrumental in operating fall of the bits, in fact as the main bit is carried by the single revolvable member, the main bit acts to bore a round shaped hole Since the expansive and retracting bits are carried by the main-bit and have operative connections with a: stationary head, said r e. tracting and expansive bits' are operated radiallyJ Since the bits, which are disposed at right angles to the mainbit, are carried by the head and have operative gear connections with the revolvable1member. said bits are rotated. The main bit and the ex pansive and retracting bits and the bits rotative at right angles to the main bitlperform their respective boring functions in order to square '51 round hole or bore other shaped holes.

A still further object embodiesarboring specifi m a s- Patented Mar. 14,1922.

1920. Serial no; 381,774.

device wherein the expansive and retracting b ts may have such operative cam or gear connections With the head of the boring device that either a round, elliptical or other shaped hole may he bored, it also being the aim n some-instancesto provide'woringear connections between the expansive bits "and the head, whereby holes of different sites may be bored. i I '2 Additionally the invention aims to 515 vide a tool of this kind vvherein various shapes and constructions of bits proper," wh ch are rotatable at rightangles to the ma n bit maybe employechit' also being the aim to vary the construction and shape of such bits. I

lVhile' the design and construction atpresent' illustrated and set :forth is deemed Pleferable, it is obvious that as a result of a reduction of the invention'to a more practical form for commercial purposes, the invention may be susceptible to changes, and the right to these changes is claimed, provided the are comprehended Within ,the scope of What is claimed. j

The invention comprises furtherfeatures and combination of parts, as will behereinatter set forth, shown in the drawings and Claimed. p i i i l n the drawingsz, r V L Figure 1 is View in elevation o'faporti ,onof a boring machine post including the chuck, and a stationary frame ot the ma,

chine, showing the improved boring deyi'ce as applied to thechuck, v

Figure is a bottomplan vievv of the bor-- mg device showing the same inengagement terial surrounding thelholebeing in section,

"with a hole which has been squared, the ma-V Figure 3 is a vertical sectional vieivv through the boring device constructed in accordance with the invention, showing the expansivebits as carried by the main and alsoishowing the bits which are rotative in directions atright angles to. theplaneof movement of the main bit, 1 r Figure 4 isv a sectionaljview on line 4 4 of Figure'ii,

' i l- Figure 5 is a detail view of a modified form of :bit for squaring-the cornersflot cylindrical hole, i

Figure 6' is a rear face viewof the bit shown in Figure 5,

Figure '7 is a vertical sectional view through a modified form'of boring device",

Figure 8 is a horizontal sectional vieiv on line 8-8 of Figure 7, showing an elliptical cam groove with which the expansive and retracting bits operatively engage, for the purpose of converting a round hole into an elliptical hole, in fact .the main bit will act to bore the hole round while the expansive and retracting bits will act to convert it elliptical in cross section,

Figure 9 is a transverse sectional view through the head of the boring tool showing another form of groove with which bits operatively connect for facilitating the boring of other shapes of holes.

Referring more especially to the drawings, 1 designates a portion of a boring machine post and 2 the frame thereof and 3 denotes the boring'machine chuck, which carries the boring spindle 4. The lower end of this spindle terminates in a main boring bit 5 which is substantially circular as shown, and the under face thereof has a depending spiral threaded leading bit (Stand merging from the thread of this leading bit and in curved directions therefrom are cutting edges 7, which terminate in cutting or lining bits 8. The leading bit 6 acts to take hold in the material which is being bored, the cutting edges 7 acting to remove the surface of the bottom of the hole, in fact shave off the material, while the cutting or lining bits 8 act to gouge into the bottom and at the same time shave the cylindrical surface of the hole.

The upper surface of the main bit 5 is provided with channels 9 which extend in directions offset from the center of the bit and receive expansive and retracting bits 10. These bits 10 are provided with cutting edges 11 which act to gouge the bottom of the hole and during the operations act to remove the material between the square corners of the hole and the diametrically opposite portions of the walls of the hole at right angles to the square corners so as to square the surface of the hole. The bits 10 also have cutting edges 12. I

It will be noted that between the cutting edges of the bits 7 and parts of the heads carrying the bits 7 the head of the drilling or boring device is cut away, so that the material or shavings will pass upwardly over the head.

In drilling or boring holes, the bits 8 are arranged, so as to cut incisions in the material, as the cutting edge 7 is cutting the bottom of the hole. These projections or cutting edges are very important, as the bit would clog without them. In fact they cut in cisions in the material to be bored prior to the cutting bits or edges 11, and as the main bit begins to cut, the material is left in small narrow strips, which break and crumble up, or fall apart, which are then easily forced upwardly above the main body of the bit or gear case.

The upward projections of the bits 10 as well as those of other bits similar to 10 are provided for the purpose of allowing the bits to have sufficient wearing and cutting surfaces. On account of repeatedly sharpening the bits they become reduced, therefore, it is necessary to have the projections opposite the cutting edges. The bits 10 when cutting the straight sides of the opening being bored or the round opening being. squared, travel the greater part of their way on a straight path except where they make the corners of the path of travel hence the lower cutting edges 11 and the cutting edges 12 on the ends of the bits 10 act to remove the material from the hole, opening or de pression being bored. The rectangular dotted lines shown at the ends of the bits 10 indicate the distancethat the bits cut into the material. 7

The boring device includes a supporting head 13 and the under surface of this head is provided with a cam groove 14. In fact, this groove 14 may be either circular, elliptical, or otherwise shaped, for instance as 90 shown in dotted lines in Figure 2. It is obvious that in case the groove 14 is constructed elliptical, the hole to. be bored by the bits 10 will be elliptical, the main bit 5 first acting to construct the hole cylindrical. 95

Should the groove 14 be made circular, the

hole to be bored bythe bits 10 will be circular. However, shouidthe groove 14 be shaped as shown in Figure 2 then the bits 10 are employed to remove the material at points, between the square corners and the 4 diametrically opposite portions of the'hole at right angles to the, square corners, for instance, the material as indicated in dotted lines as at 15 in Figure 2.

In order to retain the bits 10 in place, plates 1(5 are fitted over the portion 17 of the boring spindle and are secured to the bit 5" by means of screws 18. Also secured by screws 18 to the main bit 5 are arcuate plates 19, which act to additionally holdthe'expansive and retracting bits 10 in position; In order to cause the expansive and retract ing bits 10 to operate, cylindrical projections 20 extend upwardly from the bits 10 and engage the groove 14,regardless'offits' shape. It is obvious thatas themainbit 5' rotates with the boring spindle and as the head13 is held stationary it will be'seen that the bits 10 will operate outwardly and re- 1'20 tract, and according to the shape 'ofthe groove 14 the bits 10 will'move correspondingly to conform to the shape of' the groove, thereby constructing a hole substantially conforming to the shape of the groove. In other words, should the groove 14 be circular the hole will be cylindrical, and if the groove be constructed as shown in dotted lines in Figure 2 the bits '10 will operate to assist in squaring the hole.

The boring spindle ':operates' through the'istationary head 13 and the. stationary frame 21. The stationary frame 21 is provided with diametrically'opposite slots 22, which, as shown in Figure 1 receive projections 23 of the lower end of the frame 2 in order to hold the frame 21 stationary. As the head l3'isrigidlyfixed to the frame 21 the head 13 is also held stationary.

The head '13 comprises the upper and lower sections and parts Y24 and 25, which are secured together by means of the screws 26'.

Atpoints intermediate thescrews 26, the adjacent faces of the sections 24 and 25 of the head13 have cavities, which when the sections 24 and 25 are secured together form pockets 2? for the reception of the bevel gears 28. These'gears28 are rotatable with the radial spindles 29,which are mounted in bearings 30 and31. ofthe two'sections'or parts of the head 13. In fact the gears 28-are threaded on the radial spindles 29 and are additionally secured thereon against rotationrelatively to. the spindles by means of the set screws 32'. Thelower section 25 of the head 13 is provided with a countersink 33 inv which the main bevel drive gear 34 is operablef for. the-purpose of driving the pinions or bevel gear's 2S. .The boring spindle above the portion 17 is slightly'reduced, and constructed on the reduced portion adjacent the shoulder 35, caused to be formed by reducing the spindle at this point, are threads 36 which are engaged by the threads of the main bevel driving gear 34 to assist inholding the gear 34 on the spindle. In order to insure against movement of the main bevel drive gear, a .set screw 37 is threaded diametrically through the gear and into the spindle, thereby preventing rotation of the gear relatively to the spindle. It is obvious that as the head 13 isxstationary with the frame 1 as hereinafter described and since the boring spindle and bit 4 and 5 are roj tatable in th e head=13, themain bevel drive gear will impart movement to the pinions 28 which will transmit movement to. the radial spindles 29. x

'Ilre outerfends ofv the radial spindles 29 carry rotating bits 38 which are rotative in directions at right angles to the planepof' movement. of the :main. bit. These bits 38 act to square the corners of the hole, in fact to remove the material froni' the corners .of

a round'holeflTihe bits 38 are fastened tothe radialyspindles 29 by means of suitable threads asiin dicatedat: 39 and through the medium ofrthe set screws'lO. 1

The upper section 24 0f the'head 13 is threaded at 41 to the reduced end of the stationary frame 21. The lower part of the stationary frame 21 has an annular flange 42 whichoverlies the upper section 24 of the head 13,"there being a suitableset screw et Pin 3 passing throug h an 2 and biting into portion of the uppersecien 2.4 o the head i o e be el t head 13 in proper position relatively-tothe fr me'21' hi in rn s h t ona y;

, In bor g' holes, whe h r t ey be r un elliptical, Sqliare or otherwise shaped; the frame '21 is'first set and asthe -heade13, is carried by the frame 21' the head 13is likewise set. Movementis then imparted to the boring spindle, which in turn; transmits movement tothe main bit 5 and-through-the medium of the groove 14 the'bits 10 willbe actuated, whereasthrough the movement of the main gear 34, the radial; spindles 29ers operated. thereby acting to squareround holes, or otherwise shape them;, it depending entirely uponfthe construction of the groove 14, and'entirely upon the means for causing expansive and retracting movements of the bitslO. The gears 28ers threaded upon the shafts 28, as well as being securedbykeys as shown. r p V v 2 A circular ring plate 44 is fitted down upon the main gear 34 to act as a bearing for the gear-and this ring plate 44'has diametri cally opposite hearings 45,' 'sen1i-circular in cross section for the reception of the inner ends "of the rotative radial spindles 29.: i

In the operationof the tool as constructed vin Figure 3,*the leading .or biting bit fiacts 7 toburrow intothe material, and at the same time retain the boring apparatus to itswork.

The cutting edges 7 act to shave the bottom .of the'hole ata point from the cut formed o'r tapering bit 50 is provided, with a )lll-.

rality of teeth 47, which act to throw the shavings upward, when the shavings are, thrown against the teeth by the main "cut; ting bit, c V

In thepdrawings, Figure 7',it will .be seen 7 that the particular form' ofihead 13 is eliminated and in, its stead a head- 51 is :employed. This head-51 may have: on its under surface any-shape of cam groove; it depend ingentirely upon the construction of hole to be bored. In the present instance, the head 51 hasan elliptical groove 52', but in Figure 9- the head 51 isfo'rmed with a groove 53, similar, to the groove 14. In'the first tinstance,=- the expansive and retracting bits will form a hole which is elliptical. In the second instance the headaof the-boring device has a substantially angular groove in which case the bits 10 will cut a correspondingly shaped hole. The head 51 is held stationary to the frame 62 by means of the projections 23 and the slot 22, which is formed in the stationary frame 21; In fact, when the head 13 is removed for the purpose of attaching the head 51, the frame 21 is reattached so that the reduced threaded portion 11 of the frame 21 will screw into the head 51 thereby holding it stationary with relation to the frame 21 as by means of the head or holding screw 54.

In Figure 7 of the drawings a different form of frame is provided. This frame 62 is stationary in which the frame 21 is guided. In other words, the frame or arm 62 has an opening through which the frame or pipe 21 passes. This frame or pipe 21 moves through the opening and downwardly as the boring or drilling is accomplished, which is similar to the action of the frame 2 shown in Figure 1. In Figure 1 the frame 2 is stationary and acts as means to guide the frame or tube or pipe 21 as it moves downwardly, through the medium of the engagement'of the projections 23 operating in the slots 22.

The invention having been set forth, what is claimed as new and useful is 1. In a boring'tooL-a stationary frame having a head, a revoluble spindle operable therein and carrying a main bit, additional bits movable with and carried by the main bit and having operative connections with the head for moving the additional bits in directions offset from the center of the main bit and beyond its periphery, a plurality of auxiliary spindles mounted'in the head radially thereof and having operative connections with the spindle, and auxiliary bits carried by the auxiliary spindles, for cleaning'out and squaring the corners of a round hole. a

2. In a boring tool, a stationary frame having a head, a spindle revoluble therein and provided with a main bit having guides,- additional bits carried by and movable with and in said guides of the main bit, said additional bits'being immediately between the head and the main bit and having cam connections with the head for causing them to move in directions offset from the center of the main bit and beyond the periphery of the main 'bit,for constructingholes of different shapes in cross section. V

3. In a boring tool, a stationary frame having" a head, a spindle revoluble therein and provided with a main bit, additional bits carried by and movable with the main bit, said additional bits having cam connections with the head for causing the additional bits to move in directions offset from the center of the main bit and beyond the periphery of the main bit, for constructing holes of different shapes in cross section, a plurality of auxiliary spindles mounted radially in the head and provided with-auxiliary bits for boring out the diametrically opposite portions of a round hole to squarethe same, and operative connections between the auxiliary spindles and the main spindle, to impart movement thereto.

4. In a boringtool, a stationary frame having a head detachably connected thereto, said head comprising'two sections and.

provided with pockets, a main spindle rev oluble in the frame and carrying a main bit adjacent the lower part of the head, a gear fixed on the main. spindle, a plurality of auxiliary spindles mounted radially in' the head and operatively connected to saidgear, whereby movement is imparted to the radial spindles, auxiliary bits carried by the comprising upper and lower sections and having pockets, a main spindle revoluble in the frame and having a main bit at its lower end, a plurality of auxiliary spindles mountedradially in bearings of the head at points between the two sections and pro-:

vided with pinions operative in the pockets, auxiliary bits carried by the auxiliary spindles, a main gear fixed on the main spindle and engaging the pinions for imparting movement to the auxiliary" spindles, addi tional bits carried by the main ,bit in a revoluble direction with the main bit and hav- 111g cam operatlve connections with the head,

whereby as the spindle and the main bit 'ro- V tate, the additional bits may move in directions beyond the periphery of'the mainbit in planes offset from the center of the main.

bit.

6. In a boring apparatus, a stationary frame having a head,-a main spindle mounted in a bearing of the frameand having a main bit below the head, the upper faceof the bit having channels extending in directions offset from the center 'of the main'bit, auxiliary bits movable in said channels,fa

ring plate surroundingthe base of the spindle and interposed between the head and the main bit and secured to the main bit,-thereby covering the inner ends of the channels, a ring surrounding the head and secured to the upper face ofthe main bit, thereby covering the outer portions. of the channels,'and retaining the auxiliary bits slidably in the channels, and operative connections between the auxiliary bits and the undersurface of the head for extending the auxiliary bits be yond the periphery of the main-bit.

In aboring apparatus, a stationary frame having a head, a main spindle mounted in a bearing of the frame and having. a main bit belowthe head, the upper face of the bithaving channels extending in directions offset from the center of the main bit, ai'ixiliary bits movable in said channels, a ring plate surrounding the base of the spindle and interposed between the head and the main bit and secured to the main bit, thereby covering the inner ends of the channels, a ring surrounding the head and secured to the upper face of the main bit, thereby covering the outer portions of the channels, and retaining the auxiliary bits slidably in the channels, and pin and channel connections with the undersurfa'ce of the head for extending the auxiliary'bits beyond the periphery of the main bit.

8. In a boring apparatus, a stationary framehaving'a head; a main spindle mounted in a bearing of the frameand having a main bit below the head, the upper face of the bit having channels extending in directions offset from the center of the main bit, auxiliary bits movable in said channels, a ring plate surrounding the base of the spindle and interposed between the head and the main bit and secured to the main bit, thereby covering the inner ends of the channels, a ring surrounding the head and secured to the upper face of the main bit, thereby covering the outer portions of the channels,and retaining the auxiliary bits slidably in the channels, and operative connections between the auxiliary bits and the undersurface of the head for extending the auxiliary bits beyond the periphery of the main bit, said head having a cavity, a gear operable in the cavity and being movable with the main spindle. auxiliary spindles mounted in bearings of the head and extending radially and provided with auxiliary bits, said cavity having diametrically opposite pockets, gears operative in the pockets and being carried by the auxiliary spindles and meshing with i I .ing a main bit, a stationary frame in which the first gear, whereby motion may be imparted to the auxiliary spindles.

9. In a boring apparatus, a stationary frame having a head, a main spindle mounted in a bearing of the frame and having'a main bit below the head, the upper face of the bit having channels extending in directions oifset from the center of the main bit,

auxiliary bits movable in said channels, a ring plate surrounding the base of the spindle and interposed between the head and the main bit and secured to the main bit, thereby covering the inner ends of thechannels, a

. ring surrounding the head and secured to the upper face of the main bit, thereby covering the outer portions of the channels, and retaining the auxiliary bits slidably in the channels, and pin and channel connections with the undersurface of the head for extending the auxiliary bits beyond the periphfdle and interposed between the head and the 'main bit and secured to the main bit, thereby ery; of the main bit, said head having a cavity, a gear operable in the cavity and. be-

in movable with the main spindle, ,auxhai'y spindles mounted n bearings ofthe h'ead vandex'tendin'g radially and provided iliary spindles and meshing with the first gear, whereby motion may be imparted to the auxiliary spindles.

10; In a boring apparatus, a stationary.

frame having a head, a'main spindle mounted in a bearing of the frame and having a mambit below the head-,the upper face of the bit having channelsextending in directions'oifset from the center of the main bit,

auxiliary bits movable in said; channels, a

ring-plate surrounding the base of. the spincovering the inner ends of the channels, a ring surrounding the head and secured to theupper face of the main bit, thereby covering the outer portions'of the channels, and

retaining the auxiliary bits slidably in the channels, the underfaceof the head having a cam channel, said auxiliary bits having projections operative in said cam channel,

whereby as the main spindle is rotated, the auxiliary bits are extended beyond the periphery of the main bit..

.11. In a. boring tool, a boring spindle hav ing a main bit, a stationary frame in which the spindle revolubly' operates, said main bit having guides substantially diametrically opposed, expansive and retracting bits movable in the guides, and cam connections operatively connecting the frame and the bits and being in close position to the spindle and frame and overlying the bits, whereby the expansive and retracting bits may move out wardly and inwardly for producing irregular boring. I I 12. In a boring tool, a boring spindle havtionswith the frame, whereby the expansive and retracting bits may move outwardly and inwardly for producing irregular boring, additional bits mountedin the frame and extending in, planes radially from the spindle and at angles to the expansive and retracting bits for boring out all corners of the bore, and operative connections betwen the additional bits and the spindle for imparting motion thereto.

13. In a boring apparatus, a stationary frame having a head, a main spindle mount ed in a bearing of the frame and having a main bit below the head, the upper face of the bit having channels extending: in directions olfset from the centeroit the main bit, auxiliary bits movable in said channels, a ring plate surrounding the base of the spindle and interposed between the head and the main bit and secured to the main bit, thereby covering the inner ends of the channels, a

ring surrounding the head and secured to the upper face of the main bit, thereby covering the outer portions of the channels, and retaining the auxiliary bits slidably in the channels, and operative connections between the auxiliary bits and the under surface of the head for extending the auxiliary bits beyond the periphery of the main bit, the con struction and arrangement of said operative connections being such that as the spindle revolves, the last mentioned bits may move outwardly and inwardly in planes at right angles to the rotation of the main bit, whereby the cylindrical boring may be followed up with angular boring, and means mounted in the frame radially of the spindle for boring the corners of the bore.

14. In a boring wort spindle, a main bit thereon and provided with guides, addi-:

JAMES R. e.AnDIneToN. 

